CYPERACEAE (^SEDGE FAMlLYj 20^ 



Leaves equaling or exceeding tbe culms . . , b\. C. Dulpinoidea 

 Leaves distinctly shorter than the culms. 



Perigynia lanceolate or lance ovate . . . U2. C. setacea 

 Perigynia broad-ovate to suborbicular . . (.V2) C. aetacea, v.' ambinua 

 w, Perigynia drab to dark brown or purplish, plump, some- 

 what biconvex, 

 Perigynia obovoid, narrow-margined, abruptly short- 

 beaked o . 53. ^7. decompoHita. 



Perigynia ovoid, with rounded margins, tapering 

 gradually to a beak. 

 Inflorescence dark brown, stiff, dense, spiciform , 54, C. diandra. 

 Inflorescence light brown, flexuous, loose, sub- 

 paniculate . (54) C. diandra, v. ramona 



V. Perigynia prominently enlarged and spongy at base, con- 

 spicuously nerved, the slender beak much longer than 

 the body. 

 Perigynia 4-5 mm. long, tapering gradually from base 



to tip . o . , . o . , . 56. (7. stipata. 



Perigynia 6-9 mm. long, abruptly enlarged below into 



a disk-like base . , » . . „ „ . b1. C. crus-corvi. 

 m. Rootstock slender and elongate ; culms mostly scattered, or if 

 tufted bearing slender stolons at base z. 

 z. Perigynia thin-margined ; heads elongate, 2-8 cm. long, of 

 numerous distinct spikes. 

 Perigynia wing-margined ; inner side of leaf-sheath carti- 

 laginous to chartaceous, nerveless . . . . 58. C. arenaria. 

 Perigynia not wing-margined ; leaf-sheath green and uni- 

 formly ribbed, except at the orifice . . . . 59. C. Sariwellii. 

 e. Perigynia plump, not thin-margined ; heads ovoid to glo- 

 bose, 0.5-1.5 cm. long, of few congested spnkes. 

 Perigynia flat on the inner face, faintly nerved . . GO, C. stenophylla. 



Perigynia planoconvex, strongly nerved . , .01. 0. chord orrhiza. 



I. Spike solitary, terminal, globular or short-ovoid , . . . 62. C. capitatn. 



§ 2. Some of the spikes strictly pistillate ; stigmas 8 and achenes trigonous ; or, 

 if stigmas 2 and achenes lenticular, some of the spikes peduncled. EUCAREX 

 Griseb. A. 



A. Achenes lenticular or piano convex ; stigmas 2 (very rarely and 

 exceptionally -i) ; perigynia beakless or very short-beaked, with 

 entire or merely emarginate orifice £. 

 B. Perigynia dull C. 



C. Scales aristate or subulate-tipped, much exceeding the perigynia ; 

 pistillate spikes all peduncled I). 



D. Scales appressed-ascending ; basal sheaths rarely fibrillose. 



Awns longer than the blades of the scales ; sjtikes on wide- 

 spreading or drooping capillary peduncles ; old leaves 



revolute 63. 6'. maritima. 



Awns shorter than the blades of the scales ; spikes strongly 



ascending; old leaves involute .... 64. C. 8alina,Y. cuspid ata. 

 v. Scales spreading ; basal leafless sheaths fibrillose. 

 Leaf-sheaths glabrous. 



Perigynia inflated, wrinkled in drying. 

 Spikes flexuous or drooping, the pistillate 3.5-10 cm. 



long 65, C. criniia. 



Spikes suberect or spreading, 1-3,5 cm. long , . (65) C. criniia, v. minor, 



Perigynia tight, not inflates! , . . . . {ijb) C. criniia v. PorteH. 



Leaf-sheaths scabrous-hispid. 



Pistillate spikes 2.5-10 cm. long, drooping , . (65) C. criniia, v. gynandra. 

 Pistillate spikes suberect or spreading, 1-3.5 cm. long (65) 0. crinita, v. simulana. 

 C. Scales obtuse or acute, not aristate ; if subulate-tipped with the 

 upper spikes mostly sessile E. 



E. Perigynia compressed, lenticular or plano-convex F. 



F. Culms solitary or few ; lower sheaths slightly if at all fibril- 

 lose G. 

 G. Perigynia nerveless ff. 

 H. Perigynia plane, not twisted at tip I. 

 I. Cuhns leafy and tall, somewhat caespitose ; leaves 

 scabrous on the veins and margins ; basal off- 

 shoots chiefly erect J. 

 J. Green, scarcely glaucous ; pistillate spikes atten- 

 uate at tip 64, C. salina, v. cuapidaia. 



J. Strongly glaucwus ; pistillate spikes full and 

 rounded at tip. 

 Scales conspicuous, dark, nearly or quite equal- 

 ing the perigynia. 

 Scales blunt or acutish. 



Pistillate spikes 8-4.5 mm. thick . . . 66. C. aquattlis. 



